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Lists reactions made by a user.

Supported token types:
Expected scopes:

This method returns a list of all items (file, file comment, channel message, group message, or direct message) reacted to by a user.


This method has the URL https://slack.com/api/reactions.list and follows the Slack Web API calling conventions.

Argument Example Required Description
token xxxx-xxxxxxxxx-xxxx Required

Authentication token bearing required scopes.

count 20 Optional, default=100

Number of items to return per page.

full true Optional

If true always return the complete reaction list.

page 2 Optional, default=1

Page number of results to return.

user W1234567890 Optional

Show reactions made by this user. Defaults to the authed user.


The response contains a list of items with reactions followed by pagination information.

    "ok": true,
    "items": [
            "type": "message",
            "channel": "C2147483705",
            "message": {
                "reactions": [
                        "name": "astonished",
                        "count": 3,
                        "users": [ "U1", "U2", "U3" ]
                        "name": "clock1"
                        "count": 2,
                        "users": [ "U1", "U2", "U3" ]
            "type": "file",
            "file": { ... },
            "reactions": [
                    "name": "thumbsup",
                    "count": 1,
                    "users": [ "U1" ]
            "type": "file_comment",
            "file": { ... },
            "comment": { ... },
            "reactions": [
                    "name": "facepalm",
                    "count": 1034,
                    "users": [ "U1", "U2", "U3", "U4", "U5" ]
    "paging": {
        "count": 100,
        "total": 4,
        "page": 1,
        "pages": 1

Different item types can be reacted to. Every item in the list has a type property, the other properties depend on the type of item. The possible types are:

  • message: the item will have a message property containing a message object and a channel property containing the channel ID for the message.
  • file: this item will have a file property containing a file object.
  • file_comment: the item will have a file property containing the file object and a comment property containing the file comment.

The users array in the reactions property might not always contain all users that have reacted (we limit it to X users, and X might change), however count will always represent the count of all users who made that reaction (i.e. it may be greater than users.length). If the authenticated user has a given reaction then they are guaranteed to appear in the users array, regardless of whether count is greater than users.length or not. If the complete list of users is required they can still be obtained by specifying the full argument.

The paging information contains the count of items returned, the total number of items reacted to, the page of results returned in this response and the total number of pages available. Please note that the max count value is 1000 and the max page value is 100.


This table lists the expected errors that this method could return. However, other errors can be returned in the case where the service is down or other unexpected factors affect processing. Callers should always check the value of the ok params in the response.

Error Description

Value passed for user was invalid.


No authentication token provided.


Invalid authentication token.


Authentication token is for a deleted user or workspace.


The method was passed an argument whose name falls outside the bounds of accepted or expected values. This includes very long names and names with non-alphanumeric characters other than _. If you get this error, it is typically an indication that you have made a very malformed API call.


The method was passed a PHP-style array argument (e.g. with a name like foo[7]). These are never valid with the Slack API.


The method was called via a POST request, but the charset specified in the Content-Type header was invalid. Valid charset names are: utf-8 iso-8859-1.


The method was called via a POST request with Content-Type application/x-www-form-urlencoded or multipart/form-data, but the form data was either missing or syntactically invalid.


The method was called via a POST request, but the specified Content-Type was invalid. Valid types are: application/x-www-form-urlencoded multipart/form-data text/plain.


The method was called via a POST request and included a data payload, but the request did not include a Content-Type header.


The workspace associated with your request is currently undergoing migration to an Enterprise Organization. Web API and other platform operations will be intermittently unavailable until the transition is complete.


The method was called via a POST request, but the POST data was either missing or truncated.


This table lists the expected warnings that this method will return. However, other warnings can be returned in the case where the service is experiencing unexpected trouble.

Warning Description

The method was called via a POST request, and recommended practice for the specified Content-Type is to include a charset parameter. However, no charset was present. Specifically, non-form-data content types (e.g. text/plain) are the ones for which charset is recommended.


The method was called via a POST request, and the specified Content-Type is not defined to understand the charset parameter. However, charset was in fact present. Specifically, form-data content types (e.g. multipart/form-data) are the ones for which charset is superfluous.